Bug 289005 – REGRESSION(291130@main?): [ iOS ] imported/w3c/web-platform-tests/css/css-anchor-position/anchor-scroll-position-try-006.html is a constant failure.

• Component: CSS
• Status: RESOLVED FIXED

[Yasmin Karimi]

imported/w3c/web-platform-tests/css/css-anchor-position/anchor-scroll-position-try-006.html 

This test is a constant failure on iOS.

HISTORY:

https://results.webkit.org/?suite=layout-tests&test=imported%2Fw3c%2Fweb-platform-tests%2Fcss%2Fcss-anchor-position%2Fanchor-scroll-position-try-006.html

TEXT DIFF:

@@ -1,6 +1,6 @@
 
-FAIL Should use the last fallback position initially assert_equals: Anchored element should be at the top of anchor expected 600 but got 800
-FAIL Should use the third fallback position with enough space below assert_equals: Anchored element should be at the bottom of anchor expected 450 but got 700
-FAIL Should use the second fallback position with enough space right assert_equals: Anchored element should be at the top of anchor expected 450 but got 800
-FAIL Should use the first fallback position with enough space below and right assert_equals: Anchored element should be at the bottom of anchor expected 450 but got 700
+PASS Should use the last fallback position initially
+FAIL Should use the third fallback position with enough space below assert_equals: Anchored element should be at the bottom of anchor expected 450 but got 500
+FAIL Should use the second fallback position with enough space right assert_equals: Anchored element should be at the top of anchor expected 450 but got 600
+FAIL Should use the first fallback position with enough space below and right assert_equals: Anchored element should be at the bottom of anchor expected 550 but got 500
 
DIFF URL:

https://build.webkit.org/results/Apple-iPadOS-18-Simulator-Release-WK2-Tests/291510@main%20(485)/imported/w3c/web-platform-tests/css/css-anchor-position/anchor-scroll-position-try-006-pretty-diff.html

REPRODUCIBILITY:

I was able to reproduce this issue on the iOS 18.2 simulator at ToT using the following command:

run-webkit-tests --ios-simulator --child-processes 2 -f imported/w3c/web-platform-tests/css/css-anchor-position/anchor-scroll-position-try-006.html --iterations 5

REGRESSION:

According to the results dashboard and contextual information, the probable regression point is 291130@main. The code paths changed in this commit appear to be related to the observed regression test failure. 

This test was a flaky failure and became a constant failure after 291123@main.

[Radar WebKit Bug Importer]

<rdar://problem/146052560>

[EWS]

Test gardening commit 291524@main (4ca4492bd5ad): <https://commits.webkit.org/291524@main>

Reviewed commits have been landed. Closing PR #41804 and removing active labels.

[Antti Koivisto]

gardening was the right fix here